Hands-on practice for this lecture. Work through the exercises and quizzes to reinforce what you've learned.
Exercise 1 of 1
Side effects in the render body fire multiple times — Strict Mode makes this visible. Move them to useEffect to guarantee exactly-once execution.
Component
renders: 1External queue (should have 0 entries)
Click the button to see entries appear…
Each click should add exactly 1 entry.